- Obstetricians & Gynecologists, Springfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Springfield
- Occupational Health Care Physicians & Surgeons, Springfield - Occupational Medicine
- Occupational Health Care Professionals, Springfield
- Occupational Medicine Doctors, Springfield - Physicians & Surgeons
- Occupational Therapy, Springfield - Occupational Health Specialists
- Office Buildings & Parks, Springfield
- Office Supplies, Equipment & Office Furniture Stores, Springfield
- Oil & Gas Companies, Springfield
- Oil Change & Lubrication, Springfield - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Springfield - Oil Companies
- Oil Petroleum Wholesale, Springfield
- Open Bible Church, Springfield
- Ophthalmologists, Springfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Springfield
- Opticians, Springfield
- Optometrists, Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Springfield - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Springfield
- Ornamental Nursery, Springfield
- Ornamental Nursery Services, Springfield
- Orthodontist, Springfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Springfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Springfield
- Other Attorneys & Lawyers, Springfield
- Other Building Materials & Supplies, Springfield
- Other Electrical Products, Springfield
- Other Industrial Contractors, Springfield
- Other Lawyers & Attorneys, Springfield
- Other Lodging, Springfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Springfield
- Outdoor Advertising & Billboard, Springfield
- Outdoor Equipment & Accessories, Springfield
- Outpatient Clinics, Springfield - Care & Treatment Centers
- Outpatient Services, Springfield - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Springfield - Oxygen Concentrator, Tank, Machine, etc
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